Windows 7 comes with an option to make a folder private.
You will notice that your folder name turns green.
It means that your folder is now private / secured. Nobody can see what’s inside.
How it works?
On your Windows 7, only you will be able to see the contents of that folder.
A user that will log with a different username on your PC, in order to access that folder, will have to enter the password used by you when you’re logging into Windows.
If your username doesn’t have a password, securing that folder will be useless, everyone could access it.